Magnetic telephone.



w. w. DEAN. MAGNETIC TELEPHONE, APPLICATION FILED MAR. 29, 1909.

Patented July 18,1911.

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.. unrrnn $TAC PAEENT OFFICE 'w. pm, or ELYRIA, onto, Assionon To runDEAN ELEc'rnIccomrm,

ELYRIA, OHIO, A CORPORATION OF OHIO.

. MAGNETIt TELEPHONE.

To all whom it mag concern: Be it. known that l, \Vnruu \V. l)E.\N, n

:eitizen' of the United States, residing at Elyriu, in the county ofLorain and State of )hio, have invented a new and-useful [in--prorementin Magnetic Telephones, of. which the following is a s)ecific'atio'n.

This-invention re ates to improvements in telephone receivers,'nnd hasfor its objectan uhproved and simplified receiver which combines theadvantages of chenpness n construction and greater etliciency, beingmore particularly intend-ed "*Oi'flll'hlil} n magnetic circuit .\vitha-=lo\v rebut-a1 ee by which a greater intlueme'is'exwted on thediaphragm. By this means the some infliccnce may be exerted on the'tliup'hragiu as is exerted in the older forms, with a smaller vreceiver coil, thus placing a smaller-resist once in the hue circuit andofi'er n 'less'imwpedance to the voice currents, wine 1 greatltyincreases the clearness of speech and the e ficiency of'the instrument-Another object of my invention'is to so construct the core of theelectromagnet and the other flux conductors that the'y may be easily andcheaply manufactured, preferthe diaphra The am litude of the dia phragmsvi rations is t en a function of .the total radius, or the distance fromthe it center to the edge of the diaphragm.

By making the core and tie return condoctors integral, I am enabled to30in the laminations with few connectors,thus avoidin the use ofnonconductors of flux and the reduction of the area available for thatpurpose. The laminations are detachably clamped together and ri 'dlymounted to a base .in the receiver shel Thus the cores ma be removed anddefective coils taken ofi' wit out; dist-urbiu the other parts Theseparts are not easil disarranged by rou h usage, being firm y securedtogether. y

Specification of Letters Patent. o os d filed Jamil-2s, 1503. Serial No.486,405.

Patented July '18, 1911.

tough connecting means. Obviously I may make the laminul'ions of othershapes and designs. within the scope of the claims.

Although l-niey provide more return cir cuits'fo'r the nnignet-ic llltX,thus distributing the flux over a. larger area, preferably but two areused. I ma also place the conductor currying thc e ectric current on anyone or more of the limbs, as-I see expedient, but I prefer the formillustrated in the drawing.

tioii of the receiver taken through and partl lel to the E-shapedmember. Fig. 2 1s a cross Section of the receiver cup taken along thelines, H of Fig. 1.. Fig. 3 is an end elelvzition of the cup andcontents with the diaphragm and retaining ring removed. Fig. t-is, {inelevation of one of the E-shaped punchings,

Referring to the" drawings and to the embodiment of my invention thereshown, I have used the seine reference letters on the various parts inthe several figures.

1 is the main pint of the receiver shell on which isscrcwed the earpiece 2, The cup 4 having a base 15 upon which is screwed a retainingring 3, is placed within the shell. The diaphragm is clamped between thecup and the ring as shown. The member 5 which is preferably built, up of-E-shupcd members punched out of suitable metal and lllllsllttltt her 5and three perpendicular limbs 5, 5", and 5", one designed to form a partof the In thed-rnwings:Figure 1 is across secin Fig. 4, consists of abase ine1ncoreand the other two, the return circuit. These punclnngsare. covered with shellac,-

or otherwise insulated, and a number clumped together betweennon-magnetic brackets 7, better shown in F g. 2. Insulated ornon-mugnetic bolts 6 or other fasteners,

are then passed through the holes 14 in the laminations and correspoudinholes in the brackets, clamping them togetfie and to the brackets. Thebrackets are fastenedto the base 15 ofthe cup and the coil of theelectronuignet. 13 placed on the central limb.

cued by long transmission or the curve thereof hasalreai-ly beendistorted.

\Vhile I have shown this particular form of mounting itnvill beunderstood that I may employ other arrangements without departirzgfrom-the invention as defined by the, claims. It will also be obvious tothose skilled in the art, thatnumerous and extensired partures from. theform and details Of'llldllPPtll'illllS here shown, may be made Withoutdeparting trom the spirit of this invention, thesamc being therein shownsolely for the purpose of clearly illustrating one specific embodimentthereof.

Having thus illustrated and described my invention, I claim:

1. In a telephone receiver, the ce:iibina-' tion of a base, a pluralityof E shaped laminations, capable of conducting magnetic fillX mounted onsaid base, and rigid fastening means for clamping said laminationstogether and attaching them to the base, said clamping means dotachablyconnecting said laminations to said base.

2. In a telcpho'ne receiver, a shell, an ear piece upon said shell, :1cup within said shell, an insulation member attached to the bottom ofsaid cup, line conductors terminating upon said insulation member,angular brackets upon the base of said cup, an E-shaped flux conductingmember clamped between said brackets, a coil connected to said lineterminals and wound upon a limb of said E-shaped member, and a diaphragmconi-' pleting a magnetic circuit.

3. In a telephone receiver, the combination of a base. a plurality pt Eshaped flux conductors mounted on said base, supporting means rigidlyclamping said flux conductors to said base, said supporting meansinechan cally coupled to said base andnncuns for detachablv connectingsaid conductors to cup held in place by said cap and shell, an E-shapedflux conductor mounted in said cup, a coil iii-said cup, lgid supportingmeans for said flux conductor attached to said cup, and connectorsdetaehably conmeeting said flux conductor to said means.

5. In a magnetic telephone, the combine-- tion of a receiver shellandcap, a receiver cup held in place by said cap and shell, a pluralityof flux conductible laminatioiis, rigid fastening means clamping saidlaminations' together and attaching them to said cup. and connectorsdetachably ccinnccting said laminatiuns to said fastening meaiis.

6. In a magnetic telephone, the combination of a base, a plurality offlux conductible laminations consisting of punchings having a bodymember and three limbs of substantialiy uniform cross section throughouttheir length, rigid' supporting means therefor tightly clamping saidlaminations together and detachably connecting them to the base.

7. In a magnetic telephone, the combination of a base, a plurality ofE-shaped flux conductors detachably connected together and rigidlymounted to said base, a receiver coil mounted thereon and a vibratilediaphragm controlled thereby.

8. In a telephone receiver, a receiver shell,

an ear piece adapted to be mounted onsaid shell, :1 receiver cup clampedin position in sa id shell by the receiver cap, angular bracle ctsmounted within said cup, a plurality of E shaped laminations clamped inposition in said cup by said brackets and forming a core and returntlu'x conductors for the receiver magnet, a coil mounted on saidlaminations and a vibratile diaphragm controlled by said coil.

3. In a telephone-receiver, a receiver shell, an ear piece adapted to bemounted on said shell. :1 receiver cup, having a portion folded over andadapted to be clamped between the shell and ear iiece to position thecup in the receiver shel angular brackets mounted in said cup, aplurality of E shaped lgmiinations clamped between said brackets andforming portions of a magnetic circuit, a.

circuit, of said coil.

7 In testimony whereof I affix my signature in presence of twowitnesses. v

a )ViLLiAM'w. DEAN. V t'nessesr Q1 H. L. HARRIS,

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